The state-owned Abu Dhabi National Oil Company (ADNOC) is a holding company operating in the energy sector. ADNOC's subsidiaries specialize in oil and gas exploration and production, refining and processing, chemicals and petrochemicals, maritime transportation, distribution and support services.

Established in 1971, the company provides exploration and production through the Abu Dhabi Company for Onshore Oil OperationsAbu Dhabi Company for Onshore Oil Operations (ADCOADCO), the Abu Dhabi Marine Operating CompanyAbu Dhabi Marine Operating Company (ADMA-OPCOADMA-OPCO) and the Zakum Development CompanyZakum Development Company.

ADNOC coordinates the activities of various oilfield support service companies, in which it holds majority stakes, such as EsnaadEsnaad, the Abu Dhabi Petroleum Ports Operating CompanyAbu Dhabi Petroleum Ports Operating Company (IRSHADIRSHAD), the National Drilling CompanyNational Drilling Company (NDCNDC) and the National Petroleum Construction CompanyNational Petroleum Construction Company (NPCCNPCC).

ADNOC established the Abu Dhabi Gas Liquefaction CompanyAbu Dhabi Gas Liquefaction Company (ADGASADGAS) to turn natural and petroleum gas extracted from Abu Dhabi offshore oilfields into a source of marketable energy.

The Abu Dhabi Gas IndustriesAbu Dhabi Gas Industries (GASCOGASCO) is responsible for processing gas from onshore oil production.

Established in 1998 as a joint venture between ADNOC and Borealis, a European plastics provider, the Abu Dhabi Polymers CompanyAbu Dhabi Polymers Company (BorougeBorouge) specializes in plastics for the petrochemical sector.